Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
tjh.dev
kernel
os
linux
1/*
2 * Cryptographic API.
3 *
4 * Serpent Cipher Algorithm.
5 *
6 * Copyright (C) 2002 Dag Arne Osvik <osvik@ii.uib.no>
7 * 2003 Herbert Valerio Riedel <hvr@gnu.org>
8 *
9 * Added tnepres support: Ruben Jesus Garcia Hernandez <ruben@ugr.es>, 18.10.2004
10 * Based on code by hvr
11 *
12 * This program is free software; you can redistribute it and/or modify
13 * it under the terms of the GNU General Public License as published by
14 * the Free Software Foundation; either version 2 of the License, or
15 * (at your option) any later version.
16 */
17
18#include <linux/init.h>
19#include <linux/module.h>
20#include <linux/errno.h>
21#include <asm/byteorder.h>
22#include <linux/crypto.h>
23#include <linux/types.h>
24
25/* Key is padded to the maximum of 256 bits before round key generation.
26 * Any key length <= 256 bits (32 bytes) is allowed by the algorithm.
27 */
28
29#define SERPENT_MIN_KEY_SIZE 0
30#define SERPENT_MAX_KEY_SIZE 32
31#define SERPENT_EXPKEY_WORDS 132
32#define SERPENT_BLOCK_SIZE 16
33
34#define PHI 0x9e3779b9UL
35
36#define keyiter(a,b,c,d,i,j) \
37 b ^= d; b ^= c; b ^= a; b ^= PHI ^ i; b = rol32(b,11); k[j] = b;
38
39#define loadkeys(x0,x1,x2,x3,i) \
40 x0=k[i]; x1=k[i+1]; x2=k[i+2]; x3=k[i+3];
41
42#define storekeys(x0,x1,x2,x3,i) \
43 k[i]=x0; k[i+1]=x1; k[i+2]=x2; k[i+3]=x3;
44
45#define K(x0,x1,x2,x3,i) \
46 x3 ^= k[4*(i)+3]; x2 ^= k[4*(i)+2]; \
47 x1 ^= k[4*(i)+1]; x0 ^= k[4*(i)+0];
48
49#define LK(x0,x1,x2,x3,x4,i) \
50 x0=rol32(x0,13);\
51 x2=rol32(x2,3); x1 ^= x0; x4 = x0 << 3; \
52 x3 ^= x2; x1 ^= x2; \
53 x1=rol32(x1,1); x3 ^= x4; \
54 x3=rol32(x3,7); x4 = x1; \
55 x0 ^= x1; x4 <<= 7; x2 ^= x3; \
56 x0 ^= x3; x2 ^= x4; x3 ^= k[4*i+3]; \
57 x1 ^= k[4*i+1]; x0=rol32(x0,5); x2=rol32(x2,22);\
58 x0 ^= k[4*i+0]; x2 ^= k[4*i+2];
59
60#define KL(x0,x1,x2,x3,x4,i) \
61 x0 ^= k[4*i+0]; x1 ^= k[4*i+1]; x2 ^= k[4*i+2]; \
62 x3 ^= k[4*i+3]; x0=ror32(x0,5); x2=ror32(x2,22);\
63 x4 = x1; x2 ^= x3; x0 ^= x3; \
64 x4 <<= 7; x0 ^= x1; x1=ror32(x1,1); \
65 x2 ^= x4; x3=ror32(x3,7); x4 = x0 << 3; \
66 x1 ^= x0; x3 ^= x4; x0=ror32(x0,13);\
67 x1 ^= x2; x3 ^= x2; x2=ror32(x2,3);
68
69#define S0(x0,x1,x2,x3,x4) \
70 x4 = x3; \
71 x3 |= x0; x0 ^= x4; x4 ^= x2; \
72 x4 =~ x4; x3 ^= x1; x1 &= x0; \
73 x1 ^= x4; x2 ^= x0; x0 ^= x3; \
74 x4 |= x0; x0 ^= x2; x2 &= x1; \
75 x3 ^= x2; x1 =~ x1; x2 ^= x4; \
76 x1 ^= x2;
77
78#define S1(x0,x1,x2,x3,x4) \
79 x4 = x1; \
80 x1 ^= x0; x0 ^= x3; x3 =~ x3; \
81 x4 &= x1; x0 |= x1; x3 ^= x2; \
82 x0 ^= x3; x1 ^= x3; x3 ^= x4; \
83 x1 |= x4; x4 ^= x2; x2 &= x0; \
84 x2 ^= x1; x1 |= x0; x0 =~ x0; \
85 x0 ^= x2; x4 ^= x1;
86
87#define S2(x0,x1,x2,x3,x4) \
88 x3 =~ x3; \
89 x1 ^= x0; x4 = x0; x0 &= x2; \
90 x0 ^= x3; x3 |= x4; x2 ^= x1; \
91 x3 ^= x1; x1 &= x0; x0 ^= x2; \
92 x2 &= x3; x3 |= x1; x0 =~ x0; \
93 x3 ^= x0; x4 ^= x0; x0 ^= x2; \
94 x1 |= x2;
95
96#define S3(x0,x1,x2,x3,x4) \
97 x4 = x1; \
98 x1 ^= x3; x3 |= x0; x4 &= x0; \
99 x0 ^= x2; x2 ^= x1; x1 &= x3; \
100 x2 ^= x3; x0 |= x4; x4 ^= x3; \
101 x1 ^= x0; x0 &= x3; x3 &= x4; \
102 x3 ^= x2; x4 |= x1; x2 &= x1; \
103 x4 ^= x3; x0 ^= x3; x3 ^= x2;
104
105#define S4(x0,x1,x2,x3,x4) \
106 x4 = x3; \
107 x3 &= x0; x0 ^= x4; \
108 x3 ^= x2; x2 |= x4; x0 ^= x1; \
109 x4 ^= x3; x2 |= x0; \
110 x2 ^= x1; x1 &= x0; \
111 x1 ^= x4; x4 &= x2; x2 ^= x3; \
112 x4 ^= x0; x3 |= x1; x1 =~ x1; \
113 x3 ^= x0;
114
115#define S5(x0,x1,x2,x3,x4) \
116 x4 = x1; x1 |= x0; \
117 x2 ^= x1; x3 =~ x3; x4 ^= x0; \
118 x0 ^= x2; x1 &= x4; x4 |= x3; \
119 x4 ^= x0; x0 &= x3; x1 ^= x3; \
120 x3 ^= x2; x0 ^= x1; x2 &= x4; \
121 x1 ^= x2; x2 &= x0; \
122 x3 ^= x2;
123
124#define S6(x0,x1,x2,x3,x4) \
125 x4 = x1; \
126 x3 ^= x0; x1 ^= x2; x2 ^= x0; \
127 x0 &= x3; x1 |= x3; x4 =~ x4; \
128 x0 ^= x1; x1 ^= x2; \
129 x3 ^= x4; x4 ^= x0; x2 &= x0; \
130 x4 ^= x1; x2 ^= x3; x3 &= x1; \
131 x3 ^= x0; x1 ^= x2;
132
133#define S7(x0,x1,x2,x3,x4) \
134 x1 =~ x1; \
135 x4 = x1; x0 =~ x0; x1 &= x2; \
136 x1 ^= x3; x3 |= x4; x4 ^= x2; \
137 x2 ^= x3; x3 ^= x0; x0 |= x1; \
138 x2 &= x0; x0 ^= x4; x4 ^= x3; \
139 x3 &= x0; x4 ^= x1; \
140 x2 ^= x4; x3 ^= x1; x4 |= x0; \
141 x4 ^= x1;
142
143#define SI0(x0,x1,x2,x3,x4) \
144 x4 = x3; x1 ^= x0; \
145 x3 |= x1; x4 ^= x1; x0 =~ x0; \
146 x2 ^= x3; x3 ^= x0; x0 &= x1; \
147 x0 ^= x2; x2 &= x3; x3 ^= x4; \
148 x2 ^= x3; x1 ^= x3; x3 &= x0; \
149 x1 ^= x0; x0 ^= x2; x4 ^= x3;
150
151#define SI1(x0,x1,x2,x3,x4) \
152 x1 ^= x3; x4 = x0; \
153 x0 ^= x2; x2 =~ x2; x4 |= x1; \
154 x4 ^= x3; x3 &= x1; x1 ^= x2; \
155 x2 &= x4; x4 ^= x1; x1 |= x3; \
156 x3 ^= x0; x2 ^= x0; x0 |= x4; \
157 x2 ^= x4; x1 ^= x0; \
158 x4 ^= x1;
159
160#define SI2(x0,x1,x2,x3,x4) \
161 x2 ^= x1; x4 = x3; x3 =~ x3; \
162 x3 |= x2; x2 ^= x4; x4 ^= x0; \
163 x3 ^= x1; x1 |= x2; x2 ^= x0; \
164 x1 ^= x4; x4 |= x3; x2 ^= x3; \
165 x4 ^= x2; x2 &= x1; \
166 x2 ^= x3; x3 ^= x4; x4 ^= x0;
167
168#define SI3(x0,x1,x2,x3,x4) \
169 x2 ^= x1; \
170 x4 = x1; x1 &= x2; \
171 x1 ^= x0; x0 |= x4; x4 ^= x3; \
172 x0 ^= x3; x3 |= x1; x1 ^= x2; \
173 x1 ^= x3; x0 ^= x2; x2 ^= x3; \
174 x3 &= x1; x1 ^= x0; x0 &= x2; \
175 x4 ^= x3; x3 ^= x0; x0 ^= x1;
176
177#define SI4(x0,x1,x2,x3,x4) \
178 x2 ^= x3; x4 = x0; x0 &= x1; \
179 x0 ^= x2; x2 |= x3; x4 =~ x4; \
180 x1 ^= x0; x0 ^= x2; x2 &= x4; \
181 x2 ^= x0; x0 |= x4; \
182 x0 ^= x3; x3 &= x2; \
183 x4 ^= x3; x3 ^= x1; x1 &= x0; \
184 x4 ^= x1; x0 ^= x3;
185
186#define SI5(x0,x1,x2,x3,x4) \
187 x4 = x1; x1 |= x2; \
188 x2 ^= x4; x1 ^= x3; x3 &= x4; \
189 x2 ^= x3; x3 |= x0; x0 =~ x0; \
190 x3 ^= x2; x2 |= x0; x4 ^= x1; \
191 x2 ^= x4; x4 &= x0; x0 ^= x1; \
192 x1 ^= x3; x0 &= x2; x2 ^= x3; \
193 x0 ^= x2; x2 ^= x4; x4 ^= x3;
194
195#define SI6(x0,x1,x2,x3,x4) \
196 x0 ^= x2; \
197 x4 = x0; x0 &= x3; x2 ^= x3; \
198 x0 ^= x2; x3 ^= x1; x2 |= x4; \
199 x2 ^= x3; x3 &= x0; x0 =~ x0; \
200 x3 ^= x1; x1 &= x2; x4 ^= x0; \
201 x3 ^= x4; x4 ^= x2; x0 ^= x1; \
202 x2 ^= x0;
203
204#define SI7(x0,x1,x2,x3,x4) \
205 x4 = x3; x3 &= x0; x0 ^= x2; \
206 x2 |= x4; x4 ^= x1; x0 =~ x0; \
207 x1 |= x3; x4 ^= x0; x0 &= x2; \
208 x0 ^= x1; x1 &= x2; x3 ^= x2; \
209 x4 ^= x3; x2 &= x3; x3 |= x0; \
210 x1 ^= x4; x3 ^= x4; x4 &= x0; \
211 x4 ^= x2;
212
213struct serpent_ctx {
214 u32 expkey[SERPENT_EXPKEY_WORDS];
215};
216
217
218static int serpent_setkey(void *ctx, const u8 *key, unsigned int keylen, u32 *flags)
219{
220 u32 *k = ((struct serpent_ctx *)ctx)->expkey;
221 u8 *k8 = (u8 *)k;
222 u32 r0,r1,r2,r3,r4;
223 int i;
224
225 if ((keylen < SERPENT_MIN_KEY_SIZE)
226 || (keylen > SERPENT_MAX_KEY_SIZE))
227 {
228 *flags |= CRYPTO_TFM_RES_BAD_KEY_LEN;
229 return -EINVAL;
230 }
231
232 /* Copy key, add padding */
233
234 for (i = 0; i < keylen; ++i)
235 k8[i] = key[i];
236 if (i < SERPENT_MAX_KEY_SIZE)
237 k8[i++] = 1;
238 while (i < SERPENT_MAX_KEY_SIZE)
239 k8[i++] = 0;
240
241 /* Expand key using polynomial */
242
243 r0 = le32_to_cpu(k[3]);
244 r1 = le32_to_cpu(k[4]);
245 r2 = le32_to_cpu(k[5]);
246 r3 = le32_to_cpu(k[6]);
247 r4 = le32_to_cpu(k[7]);
248
249 keyiter(le32_to_cpu(k[0]),r0,r4,r2,0,0);
250 keyiter(le32_to_cpu(k[1]),r1,r0,r3,1,1);
251 keyiter(le32_to_cpu(k[2]),r2,r1,r4,2,2);
252 keyiter(le32_to_cpu(k[3]),r3,r2,r0,3,3);
253 keyiter(le32_to_cpu(k[4]),r4,r3,r1,4,4);
254 keyiter(le32_to_cpu(k[5]),r0,r4,r2,5,5);
255 keyiter(le32_to_cpu(k[6]),r1,r0,r3,6,6);
256 keyiter(le32_to_cpu(k[7]),r2,r1,r4,7,7);
257
258 keyiter(k[ 0],r3,r2,r0, 8, 8); keyiter(k[ 1],r4,r3,r1, 9, 9);
259 keyiter(k[ 2],r0,r4,r2, 10, 10); keyiter(k[ 3],r1,r0,r3, 11, 11);
260 keyiter(k[ 4],r2,r1,r4, 12, 12); keyiter(k[ 5],r3,r2,r0, 13, 13);
261 keyiter(k[ 6],r4,r3,r1, 14, 14); keyiter(k[ 7],r0,r4,r2, 15, 15);
262 keyiter(k[ 8],r1,r0,r3, 16, 16); keyiter(k[ 9],r2,r1,r4, 17, 17);
263 keyiter(k[ 10],r3,r2,r0, 18, 18); keyiter(k[ 11],r4,r3,r1, 19, 19);
264 keyiter(k[ 12],r0,r4,r2, 20, 20); keyiter(k[ 13],r1,r0,r3, 21, 21);
265 keyiter(k[ 14],r2,r1,r4, 22, 22); keyiter(k[ 15],r3,r2,r0, 23, 23);
266 keyiter(k[ 16],r4,r3,r1, 24, 24); keyiter(k[ 17],r0,r4,r2, 25, 25);
267 keyiter(k[ 18],r1,r0,r3, 26, 26); keyiter(k[ 19],r2,r1,r4, 27, 27);
268 keyiter(k[ 20],r3,r2,r0, 28, 28); keyiter(k[ 21],r4,r3,r1, 29, 29);
269 keyiter(k[ 22],r0,r4,r2, 30, 30); keyiter(k[ 23],r1,r0,r3, 31, 31);
270
271 k += 50;
272
273 keyiter(k[-26],r2,r1,r4, 32,-18); keyiter(k[-25],r3,r2,r0, 33,-17);
274 keyiter(k[-24],r4,r3,r1, 34,-16); keyiter(k[-23],r0,r4,r2, 35,-15);
275 keyiter(k[-22],r1,r0,r3, 36,-14); keyiter(k[-21],r2,r1,r4, 37,-13);
276 keyiter(k[-20],r3,r2,r0, 38,-12); keyiter(k[-19],r4,r3,r1, 39,-11);
277 keyiter(k[-18],r0,r4,r2, 40,-10); keyiter(k[-17],r1,r0,r3, 41, -9);
278 keyiter(k[-16],r2,r1,r4, 42, -8); keyiter(k[-15],r3,r2,r0, 43, -7);
279 keyiter(k[-14],r4,r3,r1, 44, -6); keyiter(k[-13],r0,r4,r2, 45, -5);
280 keyiter(k[-12],r1,r0,r3, 46, -4); keyiter(k[-11],r2,r1,r4, 47, -3);
281 keyiter(k[-10],r3,r2,r0, 48, -2); keyiter(k[ -9],r4,r3,r1, 49, -1);
282 keyiter(k[ -8],r0,r4,r2, 50, 0); keyiter(k[ -7],r1,r0,r3, 51, 1);
283 keyiter(k[ -6],r2,r1,r4, 52, 2); keyiter(k[ -5],r3,r2,r0, 53, 3);
284 keyiter(k[ -4],r4,r3,r1, 54, 4); keyiter(k[ -3],r0,r4,r2, 55, 5);
285 keyiter(k[ -2],r1,r0,r3, 56, 6); keyiter(k[ -1],r2,r1,r4, 57, 7);
286 keyiter(k[ 0],r3,r2,r0, 58, 8); keyiter(k[ 1],r4,r3,r1, 59, 9);
287 keyiter(k[ 2],r0,r4,r2, 60, 10); keyiter(k[ 3],r1,r0,r3, 61, 11);
288 keyiter(k[ 4],r2,r1,r4, 62, 12); keyiter(k[ 5],r3,r2,r0, 63, 13);
289 keyiter(k[ 6],r4,r3,r1, 64, 14); keyiter(k[ 7],r0,r4,r2, 65, 15);
290 keyiter(k[ 8],r1,r0,r3, 66, 16); keyiter(k[ 9],r2,r1,r4, 67, 17);
291 keyiter(k[ 10],r3,r2,r0, 68, 18); keyiter(k[ 11],r4,r3,r1, 69, 19);
292 keyiter(k[ 12],r0,r4,r2, 70, 20); keyiter(k[ 13],r1,r0,r3, 71, 21);
293 keyiter(k[ 14],r2,r1,r4, 72, 22); keyiter(k[ 15],r3,r2,r0, 73, 23);
294 keyiter(k[ 16],r4,r3,r1, 74, 24); keyiter(k[ 17],r0,r4,r2, 75, 25);
295 keyiter(k[ 18],r1,r0,r3, 76, 26); keyiter(k[ 19],r2,r1,r4, 77, 27);
296 keyiter(k[ 20],r3,r2,r0, 78, 28); keyiter(k[ 21],r4,r3,r1, 79, 29);
297 keyiter(k[ 22],r0,r4,r2, 80, 30); keyiter(k[ 23],r1,r0,r3, 81, 31);
298
299 k += 50;
300
301 keyiter(k[-26],r2,r1,r4, 82,-18); keyiter(k[-25],r3,r2,r0, 83,-17);
302 keyiter(k[-24],r4,r3,r1, 84,-16); keyiter(k[-23],r0,r4,r2, 85,-15);
303 keyiter(k[-22],r1,r0,r3, 86,-14); keyiter(k[-21],r2,r1,r4, 87,-13);
304 keyiter(k[-20],r3,r2,r0, 88,-12); keyiter(k[-19],r4,r3,r1, 89,-11);
305 keyiter(k[-18],r0,r4,r2, 90,-10); keyiter(k[-17],r1,r0,r3, 91, -9);
306 keyiter(k[-16],r2,r1,r4, 92, -8); keyiter(k[-15],r3,r2,r0, 93, -7);
307 keyiter(k[-14],r4,r3,r1, 94, -6); keyiter(k[-13],r0,r4,r2, 95, -5);
308 keyiter(k[-12],r1,r0,r3, 96, -4); keyiter(k[-11],r2,r1,r4, 97, -3);
309 keyiter(k[-10],r3,r2,r0, 98, -2); keyiter(k[ -9],r4,r3,r1, 99, -1);
310 keyiter(k[ -8],r0,r4,r2,100, 0); keyiter(k[ -7],r1,r0,r3,101, 1);
311 keyiter(k[ -6],r2,r1,r4,102, 2); keyiter(k[ -5],r3,r2,r0,103, 3);
312 keyiter(k[ -4],r4,r3,r1,104, 4); keyiter(k[ -3],r0,r4,r2,105, 5);
313 keyiter(k[ -2],r1,r0,r3,106, 6); keyiter(k[ -1],r2,r1,r4,107, 7);
314 keyiter(k[ 0],r3,r2,r0,108, 8); keyiter(k[ 1],r4,r3,r1,109, 9);
315 keyiter(k[ 2],r0,r4,r2,110, 10); keyiter(k[ 3],r1,r0,r3,111, 11);
316 keyiter(k[ 4],r2,r1,r4,112, 12); keyiter(k[ 5],r3,r2,r0,113, 13);
317 keyiter(k[ 6],r4,r3,r1,114, 14); keyiter(k[ 7],r0,r4,r2,115, 15);
318 keyiter(k[ 8],r1,r0,r3,116, 16); keyiter(k[ 9],r2,r1,r4,117, 17);
319 keyiter(k[ 10],r3,r2,r0,118, 18); keyiter(k[ 11],r4,r3,r1,119, 19);
320 keyiter(k[ 12],r0,r4,r2,120, 20); keyiter(k[ 13],r1,r0,r3,121, 21);
321 keyiter(k[ 14],r2,r1,r4,122, 22); keyiter(k[ 15],r3,r2,r0,123, 23);
322 keyiter(k[ 16],r4,r3,r1,124, 24); keyiter(k[ 17],r0,r4,r2,125, 25);
323 keyiter(k[ 18],r1,r0,r3,126, 26); keyiter(k[ 19],r2,r1,r4,127, 27);
324 keyiter(k[ 20],r3,r2,r0,128, 28); keyiter(k[ 21],r4,r3,r1,129, 29);
325 keyiter(k[ 22],r0,r4,r2,130, 30); keyiter(k[ 23],r1,r0,r3,131, 31);
326
327 /* Apply S-boxes */
328
329 S3(r3,r4,r0,r1,r2); storekeys(r1,r2,r4,r3, 28); loadkeys(r1,r2,r4,r3, 24);
330 S4(r1,r2,r4,r3,r0); storekeys(r2,r4,r3,r0, 24); loadkeys(r2,r4,r3,r0, 20);
331 S5(r2,r4,r3,r0,r1); storekeys(r1,r2,r4,r0, 20); loadkeys(r1,r2,r4,r0, 16);
332 S6(r1,r2,r4,r0,r3); storekeys(r4,r3,r2,r0, 16); loadkeys(r4,r3,r2,r0, 12);
333 S7(r4,r3,r2,r0,r1); storekeys(r1,r2,r0,r4, 12); loadkeys(r1,r2,r0,r4, 8);
334 S0(r1,r2,r0,r4,r3); storekeys(r0,r2,r4,r1, 8); loadkeys(r0,r2,r4,r1, 4);
335 S1(r0,r2,r4,r1,r3); storekeys(r3,r4,r1,r0, 4); loadkeys(r3,r4,r1,r0, 0);
336 S2(r3,r4,r1,r0,r2); storekeys(r2,r4,r3,r0, 0); loadkeys(r2,r4,r3,r0, -4);
337 S3(r2,r4,r3,r0,r1); storekeys(r0,r1,r4,r2, -4); loadkeys(r0,r1,r4,r2, -8);
338 S4(r0,r1,r4,r2,r3); storekeys(r1,r4,r2,r3, -8); loadkeys(r1,r4,r2,r3,-12);
339 S5(r1,r4,r2,r3,r0); storekeys(r0,r1,r4,r3,-12); loadkeys(r0,r1,r4,r3,-16);
340 S6(r0,r1,r4,r3,r2); storekeys(r4,r2,r1,r3,-16); loadkeys(r4,r2,r1,r3,-20);
341 S7(r4,r2,r1,r3,r0); storekeys(r0,r1,r3,r4,-20); loadkeys(r0,r1,r3,r4,-24);
342 S0(r0,r1,r3,r4,r2); storekeys(r3,r1,r4,r0,-24); loadkeys(r3,r1,r4,r0,-28);
343 k -= 50;
344 S1(r3,r1,r4,r0,r2); storekeys(r2,r4,r0,r3, 22); loadkeys(r2,r4,r0,r3, 18);
345 S2(r2,r4,r0,r3,r1); storekeys(r1,r4,r2,r3, 18); loadkeys(r1,r4,r2,r3, 14);
346 S3(r1,r4,r2,r3,r0); storekeys(r3,r0,r4,r1, 14); loadkeys(r3,r0,r4,r1, 10);
347 S4(r3,r0,r4,r1,r2); storekeys(r0,r4,r1,r2, 10); loadkeys(r0,r4,r1,r2, 6);
348 S5(r0,r4,r1,r2,r3); storekeys(r3,r0,r4,r2, 6); loadkeys(r3,r0,r4,r2, 2);
349 S6(r3,r0,r4,r2,r1); storekeys(r4,r1,r0,r2, 2); loadkeys(r4,r1,r0,r2, -2);
350 S7(r4,r1,r0,r2,r3); storekeys(r3,r0,r2,r4, -2); loadkeys(r3,r0,r2,r4, -6);
351 S0(r3,r0,r2,r4,r1); storekeys(r2,r0,r4,r3, -6); loadkeys(r2,r0,r4,r3,-10);
352 S1(r2,r0,r4,r3,r1); storekeys(r1,r4,r3,r2,-10); loadkeys(r1,r4,r3,r2,-14);
353 S2(r1,r4,r3,r2,r0); storekeys(r0,r4,r1,r2,-14); loadkeys(r0,r4,r1,r2,-18);
354 S3(r0,r4,r1,r2,r3); storekeys(r2,r3,r4,r0,-18); loadkeys(r2,r3,r4,r0,-22);
355 k -= 50;
356 S4(r2,r3,r4,r0,r1); storekeys(r3,r4,r0,r1, 28); loadkeys(r3,r4,r0,r1, 24);
357 S5(r3,r4,r0,r1,r2); storekeys(r2,r3,r4,r1, 24); loadkeys(r2,r3,r4,r1, 20);
358 S6(r2,r3,r4,r1,r0); storekeys(r4,r0,r3,r1, 20); loadkeys(r4,r0,r3,r1, 16);
359 S7(r4,r0,r3,r1,r2); storekeys(r2,r3,r1,r4, 16); loadkeys(r2,r3,r1,r4, 12);
360 S0(r2,r3,r1,r4,r0); storekeys(r1,r3,r4,r2, 12); loadkeys(r1,r3,r4,r2, 8);
361 S1(r1,r3,r4,r2,r0); storekeys(r0,r4,r2,r1, 8); loadkeys(r0,r4,r2,r1, 4);
362 S2(r0,r4,r2,r1,r3); storekeys(r3,r4,r0,r1, 4); loadkeys(r3,r4,r0,r1, 0);
363 S3(r3,r4,r0,r1,r2); storekeys(r1,r2,r4,r3, 0);
364
365 return 0;
366}
367
368static void serpent_encrypt(void *ctx, u8 *dst, const u8 *src)
369{
370 const u32
371 *k = ((struct serpent_ctx *)ctx)->expkey,
372 *s = (const u32 *)src;
373 u32 *d = (u32 *)dst,
374 r0, r1, r2, r3, r4;
375
376/*
377 * Note: The conversions between u8* and u32* might cause trouble
378 * on architectures with stricter alignment rules than x86
379 */
380
381 r0 = le32_to_cpu(s[0]);
382 r1 = le32_to_cpu(s[1]);
383 r2 = le32_to_cpu(s[2]);
384 r3 = le32_to_cpu(s[3]);
385
386 K(r0,r1,r2,r3,0);
387 S0(r0,r1,r2,r3,r4); LK(r2,r1,r3,r0,r4,1);
388 S1(r2,r1,r3,r0,r4); LK(r4,r3,r0,r2,r1,2);
389 S2(r4,r3,r0,r2,r1); LK(r1,r3,r4,r2,r0,3);
390 S3(r1,r3,r4,r2,r0); LK(r2,r0,r3,r1,r4,4);
391 S4(r2,r0,r3,r1,r4); LK(r0,r3,r1,r4,r2,5);
392 S5(r0,r3,r1,r4,r2); LK(r2,r0,r3,r4,r1,6);
393 S6(r2,r0,r3,r4,r1); LK(r3,r1,r0,r4,r2,7);
394 S7(r3,r1,r0,r4,r2); LK(r2,r0,r4,r3,r1,8);
395 S0(r2,r0,r4,r3,r1); LK(r4,r0,r3,r2,r1,9);
396 S1(r4,r0,r3,r2,r1); LK(r1,r3,r2,r4,r0,10);
397 S2(r1,r3,r2,r4,r0); LK(r0,r3,r1,r4,r2,11);
398 S3(r0,r3,r1,r4,r2); LK(r4,r2,r3,r0,r1,12);
399 S4(r4,r2,r3,r0,r1); LK(r2,r3,r0,r1,r4,13);
400 S5(r2,r3,r0,r1,r4); LK(r4,r2,r3,r1,r0,14);
401 S6(r4,r2,r3,r1,r0); LK(r3,r0,r2,r1,r4,15);
402 S7(r3,r0,r2,r1,r4); LK(r4,r2,r1,r3,r0,16);
403 S0(r4,r2,r1,r3,r0); LK(r1,r2,r3,r4,r0,17);
404 S1(r1,r2,r3,r4,r0); LK(r0,r3,r4,r1,r2,18);
405 S2(r0,r3,r4,r1,r2); LK(r2,r3,r0,r1,r4,19);
406 S3(r2,r3,r0,r1,r4); LK(r1,r4,r3,r2,r0,20);
407 S4(r1,r4,r3,r2,r0); LK(r4,r3,r2,r0,r1,21);
408 S5(r4,r3,r2,r0,r1); LK(r1,r4,r3,r0,r2,22);
409 S6(r1,r4,r3,r0,r2); LK(r3,r2,r4,r0,r1,23);
410 S7(r3,r2,r4,r0,r1); LK(r1,r4,r0,r3,r2,24);
411 S0(r1,r4,r0,r3,r2); LK(r0,r4,r3,r1,r2,25);
412 S1(r0,r4,r3,r1,r2); LK(r2,r3,r1,r0,r4,26);
413 S2(r2,r3,r1,r0,r4); LK(r4,r3,r2,r0,r1,27);
414 S3(r4,r3,r2,r0,r1); LK(r0,r1,r3,r4,r2,28);
415 S4(r0,r1,r3,r4,r2); LK(r1,r3,r4,r2,r0,29);
416 S5(r1,r3,r4,r2,r0); LK(r0,r1,r3,r2,r4,30);
417 S6(r0,r1,r3,r2,r4); LK(r3,r4,r1,r2,r0,31);
418 S7(r3,r4,r1,r2,r0); K(r0,r1,r2,r3,32);
419
420 d[0] = cpu_to_le32(r0);
421 d[1] = cpu_to_le32(r1);
422 d[2] = cpu_to_le32(r2);
423 d[3] = cpu_to_le32(r3);
424}
425
426static void serpent_decrypt(void *ctx, u8 *dst, const u8 *src)
427{
428 const u32
429 *k = ((struct serpent_ctx *)ctx)->expkey,
430 *s = (const u32 *)src;
431 u32 *d = (u32 *)dst,
432 r0, r1, r2, r3, r4;
433
434 r0 = le32_to_cpu(s[0]);
435 r1 = le32_to_cpu(s[1]);
436 r2 = le32_to_cpu(s[2]);
437 r3 = le32_to_cpu(s[3]);
438
439 K(r0,r1,r2,r3,32);
440 SI7(r0,r1,r2,r3,r4); KL(r1,r3,r0,r4,r2,31);
441 SI6(r1,r3,r0,r4,r2); KL(r0,r2,r4,r1,r3,30);
442 SI5(r0,r2,r4,r1,r3); KL(r2,r3,r0,r4,r1,29);
443 SI4(r2,r3,r0,r4,r1); KL(r2,r0,r1,r4,r3,28);
444 SI3(r2,r0,r1,r4,r3); KL(r1,r2,r3,r4,r0,27);
445 SI2(r1,r2,r3,r4,r0); KL(r2,r0,r4,r3,r1,26);
446 SI1(r2,r0,r4,r3,r1); KL(r1,r0,r4,r3,r2,25);
447 SI0(r1,r0,r4,r3,r2); KL(r4,r2,r0,r1,r3,24);
448 SI7(r4,r2,r0,r1,r3); KL(r2,r1,r4,r3,r0,23);
449 SI6(r2,r1,r4,r3,r0); KL(r4,r0,r3,r2,r1,22);
450 SI5(r4,r0,r3,r2,r1); KL(r0,r1,r4,r3,r2,21);
451 SI4(r0,r1,r4,r3,r2); KL(r0,r4,r2,r3,r1,20);
452 SI3(r0,r4,r2,r3,r1); KL(r2,r0,r1,r3,r4,19);
453 SI2(r2,r0,r1,r3,r4); KL(r0,r4,r3,r1,r2,18);
454 SI1(r0,r4,r3,r1,r2); KL(r2,r4,r3,r1,r0,17);
455 SI0(r2,r4,r3,r1,r0); KL(r3,r0,r4,r2,r1,16);
456 SI7(r3,r0,r4,r2,r1); KL(r0,r2,r3,r1,r4,15);
457 SI6(r0,r2,r3,r1,r4); KL(r3,r4,r1,r0,r2,14);
458 SI5(r3,r4,r1,r0,r2); KL(r4,r2,r3,r1,r0,13);
459 SI4(r4,r2,r3,r1,r0); KL(r4,r3,r0,r1,r2,12);
460 SI3(r4,r3,r0,r1,r2); KL(r0,r4,r2,r1,r3,11);
461 SI2(r0,r4,r2,r1,r3); KL(r4,r3,r1,r2,r0,10);
462 SI1(r4,r3,r1,r2,r0); KL(r0,r3,r1,r2,r4,9);
463 SI0(r0,r3,r1,r2,r4); KL(r1,r4,r3,r0,r2,8);
464 SI7(r1,r4,r3,r0,r2); KL(r4,r0,r1,r2,r3,7);
465 SI6(r4,r0,r1,r2,r3); KL(r1,r3,r2,r4,r0,6);
466 SI5(r1,r3,r2,r4,r0); KL(r3,r0,r1,r2,r4,5);
467 SI4(r3,r0,r1,r2,r4); KL(r3,r1,r4,r2,r0,4);
468 SI3(r3,r1,r4,r2,r0); KL(r4,r3,r0,r2,r1,3);
469 SI2(r4,r3,r0,r2,r1); KL(r3,r1,r2,r0,r4,2);
470 SI1(r3,r1,r2,r0,r4); KL(r4,r1,r2,r0,r3,1);
471 SI0(r4,r1,r2,r0,r3); K(r2,r3,r1,r4,0);
472
473 d[0] = cpu_to_le32(r2);
474 d[1] = cpu_to_le32(r3);
475 d[2] = cpu_to_le32(r1);
476 d[3] = cpu_to_le32(r4);
477}
478
479static struct crypto_alg serpent_alg = {
480 .cra_name = "serpent",
481 .cra_flags = CRYPTO_ALG_TYPE_CIPHER,
482 .cra_blocksize = SERPENT_BLOCK_SIZE,
483 .cra_ctxsize = sizeof(struct serpent_ctx),
484 .cra_module = THIS_MODULE,
485 .cra_list = LIST_HEAD_INIT(serpent_alg.cra_list),
486 .cra_u = { .cipher = {
487 .cia_min_keysize = SERPENT_MIN_KEY_SIZE,
488 .cia_max_keysize = SERPENT_MAX_KEY_SIZE,
489 .cia_setkey = serpent_setkey,
490 .cia_encrypt = serpent_encrypt,
491 .cia_decrypt = serpent_decrypt } }
492};
493
494static int tnepres_setkey(void *ctx, const u8 *key, unsigned int keylen, u32 *flags)
495{
496 u8 rev_key[SERPENT_MAX_KEY_SIZE];
497 int i;
498
499 if ((keylen < SERPENT_MIN_KEY_SIZE)
500 || (keylen > SERPENT_MAX_KEY_SIZE)) {
501 *flags |= CRYPTO_TFM_RES_BAD_KEY_LEN;
502 return -EINVAL;
503 }
504
505 for (i = 0; i < keylen; ++i)
506 rev_key[keylen - i - 1] = key[i];
507
508 return serpent_setkey(ctx, rev_key, keylen, flags);
509}
510
511static void tnepres_encrypt(void *ctx, u8 *dst, const u8 *src)
512{
513 const u32 * const s = (const u32 * const)src;
514 u32 * const d = (u32 * const)dst;
515
516 u32 rs[4], rd[4];
517
518 rs[0] = swab32(s[3]);
519 rs[1] = swab32(s[2]);
520 rs[2] = swab32(s[1]);
521 rs[3] = swab32(s[0]);
522
523 serpent_encrypt(ctx, (u8 *)rd, (u8 *)rs);
524
525 d[0] = swab32(rd[3]);
526 d[1] = swab32(rd[2]);
527 d[2] = swab32(rd[1]);
528 d[3] = swab32(rd[0]);
529}
530
531static void tnepres_decrypt(void *ctx, u8 *dst, const u8 *src)
532{
533 const u32 * const s = (const u32 * const)src;
534 u32 * const d = (u32 * const)dst;
535
536 u32 rs[4], rd[4];
537
538 rs[0] = swab32(s[3]);
539 rs[1] = swab32(s[2]);
540 rs[2] = swab32(s[1]);
541 rs[3] = swab32(s[0]);
542
543 serpent_decrypt(ctx, (u8 *)rd, (u8 *)rs);
544
545 d[0] = swab32(rd[3]);
546 d[1] = swab32(rd[2]);
547 d[2] = swab32(rd[1]);
548 d[3] = swab32(rd[0]);
549}
550
551static struct crypto_alg tnepres_alg = {
552 .cra_name = "tnepres",
553 .cra_flags = CRYPTO_ALG_TYPE_CIPHER,
554 .cra_blocksize = SERPENT_BLOCK_SIZE,
555 .cra_ctxsize = sizeof(struct serpent_ctx),
556 .cra_alignmask = 3,
557 .cra_module = THIS_MODULE,
558 .cra_list = LIST_HEAD_INIT(serpent_alg.cra_list),
559 .cra_u = { .cipher = {
560 .cia_min_keysize = SERPENT_MIN_KEY_SIZE,
561 .cia_max_keysize = SERPENT_MAX_KEY_SIZE,
562 .cia_setkey = tnepres_setkey,
563 .cia_encrypt = tnepres_encrypt,
564 .cia_decrypt = tnepres_decrypt } }
565};
566
567static int __init init(void)
568{
569 int ret = crypto_register_alg(&serpent_alg);
570
571 if (ret)
572 return ret;
573
574 ret = crypto_register_alg(&tnepres_alg);
575
576 if (ret)
577 crypto_unregister_alg(&serpent_alg);
578
579 return ret;
580}
581
582static void __exit fini(void)
583{
584 crypto_unregister_alg(&tnepres_alg);
585 crypto_unregister_alg(&serpent_alg);
586}
587
588module_init(init);
589module_exit(fini);
590
591MODULE_LICENSE("GPL");
592MODULE_DESCRIPTION("Serpent and tnepres (kerneli compatible serpent reversed) Cipher Algorithm");
593MODULE_AUTHOR("Dag Arne Osvik <osvik@ii.uib.no>");
594MODULE_ALIAS("tnepres");